bell work (buff binder): copy the question below and write your entire answer: gametes produced by...
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Today we’re going to look at how plants maintain homeostasis.TRANSCRIPT
BELL WORK (Buff Binder):Copy the question below and write your entire answer:
Gametes produced by flowers are used to carry out what function?
a. Transportationb. Photosynthesisc. Gravitropismd. Reproduction
Set up today’s page…
• Page: 66• Date: 2-19-15• Title: Plant Transport• Essential Question: How do the
support and transport systems help plants maintain homeostasis?• YES, Cornell notes!
Today we’re going to look at how plants maintain homeostasis.
STRUCTURE & SUPPORT
Roots: • Hold plant in
position• Absorb water
and minerals from the soil• Contain
specialized cells for water intake
(Wheat seed)
Root hairs
Fragile parts of cells that grow from the main root
They massively increase the surface area for absorption
Root hair cells (x150)
Stems:
•Support structures
•connect and carry water & nutrients between roots and leaves
TRANSPORT SYSTEM
Vascular tissue: specialized tissues used to move water and nutrients throughout a plant
Xylem: cells that carry water up from
the roots
Phloem: cells that transport food (from
photosynthesis) down from the leaves
What about leaves?
Leaves: organs that perform photosynthesis and contain vascular tissue
Cuticle: a thick waxy layer that protects against injury and water loss
GAS EXCHANGE
• Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf
• They have small holes called stomata on the under surface
• Each hole is open & closed by 2 guard cells
Stomata: openings in the underside of a leaf
that allow carbon dioxide and oxygen to
diffuse (move) into and out of the leaf
Guard cells: specialized cells that control the
opening and closing of stomata
Each opening is controlled by two guard cells.
closed open
gas exchange in the leaf
Carbon dioxide
oxygenGuard cell
Structures of the Leaf
Photosynthesis
Conserves water
Transports water and sugar to stem
and roots
Why do stomata open and close?
Stomata open and close at different times of the day
OPEN = when carbon dioxide is needed for photosynthesis
CLOSED = to conserve water
Gas exchange
Transpiration: the loss of water through leaves
Debrief/Summary: Explain how a plant might respond to each of the following situations…
1. drought (not enough water)2. flood (too much water)3. extra carbon dioxide in the air due to
some crazy person singing to their plants4. not enough carbon dioxide in the air